dpk coventional clarifier
TRANSCRIPT
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Water TreatmentPackage Plant Design
Sedimentation TankDesign
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Sedimentation Tank design
Typical design criteria for horizontal-flow rectangular tanks with tube settlers
MWH pp.823
"Tube settlers typically have detention time less than 20min, but they still have a settling efficientycomparable to that of a rectangular settling tank with a minimum 2h detention time."
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Water TreatmentPackage Plant Design
Sedimentation TankDesign
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General Data
Raw water, Q = MLDRaw water, Q = m3/s
Number of basin = No.
Unit Load = m3/s= MLD
Tube settlers
Length Lp = mWidth d = m
Settling Velocity, Vs = m/s AssumedƟ = 60 degrees
Adopted Parameters
Settling Zone Dimension by trial and error
Width W = m AssumedDepth D = m AssumedLength L = m Assumed
Settling Area, = m2Vf Ɵ = m/sVf Ɵ = m/h < 2.5 to 6.25 m/h
Total TankWidth W = mDepth D = mTotal Length L = m
Tank volume, V = m3 including additional % for settling.Thus, Total length = m
Detention time, T = s= 79 min ( 6 to 10 min.) OK
2.5
0.625
11.50.00206
0.00061
0.05
2.32.4
6.25
6.25
0.0289
4
2.31
0.9
0.00723
34.5
5
4769
25
7.42918
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Water TreatmentPackage Plant Design
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MWH, pp.810
Design Calculations
Settling Velocity, Vs = m/s Assumed
Countercurrent Settlers
= s
= s
Reynolds Number < 20,000
=
Froude Number > 0.00001
=vf = m/sAx = m2Pw = mv = m2/sg = m/s2Rh = m
1E-067.1
85.906
479.39
0.0006
1598
5.58E-070.0021
5.52
9.810.7775
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Water TreatmentPackage Plant Design
Sedimentation TankDesign
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Water Treatment Unit Processes: Physical and Chemical pp.590By David W. Hendricks
Submerged Trough Design
Trough Design
Input Load = m3/s (includes both clarifier discharge)
Wash down loss = % Assumed
Est. Trough load = m3/s or MLDMax. over flow Rate, vf = m/s
Area Req. , Ax = m2
Trough width = mwater depth = mFree board = mTrough heigth = m
2.375
11.3
13.3
0.0021
1.211.10.2
0.0289
5
0.0275
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